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A compound for detecting an analyte using Surface Enhanced Raman Spectroscopy (SERS) and a method of forming the compound is provided. The compound has Formula I: wherein W is selected from the group consisting of an optionally substituted aryl group and an optionally substituted heteroaryl group;

A compound for detecting an analyte using Surface Enhanced Raman Spectroscopy (SERS) and a method of forming the compound is provided. The compound has Formula I: wherein W is selected from the group consisting of an optionally substituted aryl group and an optionally substituted heteroaryl group; each Y independently is NR1R2, wherein R1 and R2 are independently selected from the group consisting of H and C1-C6 alkyl, or R1 and R2 combine to form together with the nitrogen to which they are attached a heterocyclic group with 4 to 5 carbon atoms, is used to denote a single or a double bond, and Z is NH, NH2, NH—(C═O)—(CH2)n—SH, wherein n=1 to 10, or or a tautomer or stereoisomer thereof, or a salt thereof. A method and device for detecting an analyte using Surface Enhanced Raman Spectroscopy (SERS) is also provided.

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1. A compound having Formula I: wherein W is selected from the group consisting of wherein the symbol “*” denotes the point at which W may be connected to the remainder of the compound of Formula I; Y is selected from NH2, N(CH3)2 or is used to denote a single bond or a double bond, andZ is NH, NH2

1. A compound having Formula I: wherein W is selected from the group consisting of wherein the symbol “*” denotes the point at which W may be connected to the remainder of the compound of Formula I; Y is selected from NH2, N(CH3)2 or is used to denote a single bond or a double bond, andZ is NH, NH2, or or a tautomer or stereoisomer thereof, or a salt thereof. 2. The compound according to claim 1, wherein W is selected from the group consisting of 3. The compound according to claim 1, wherein Y is N(CH3)2 and W is selected from the group consisting of 4. The compound according to claim 1, wherein Y is and W is selected from the group consisting of 5. The compound according to claim 1, wherein the compound is selected from the group consisting of 6. The compound according to claim 1, wherein the compound is selected from the group consisting of 7. A SERS marker conjugate comprising a nanoparticle and a Raman-active marker compound attached to the nanoparticle surface, wherein the compound has Formula I: wherein W is selected from the group consisting of wherein the symbol “*” denotes the point at which W may be connected to the remainder of the compound of Formula I; selected from NH2, N(CH3)2 or is used to denote a single bond or a double bond, andZ is NH, NH2, or or a tautomer or stereoisomer thereof, or a salt thereof. 8. The SERS marker conjugate according to claim 7, further comprising an analyte-binding molecule coupled to the Raman-active marker compound, wherein the analyte binding molecule is an antibody. 9. The SERS marker conjugate according to claim 7, wherein the nanoparticle is coated with or consisting of a noble metal. 10. The SERS marker conjugate according to claim 9, wherein the noble metal is gold. 11. The SERS marker conjugate according to claim 7, wherein the nanoparticle is a citrate-stabilized gold nanoparticle. 12. The SERS marker conjugate according to claim 7, further comprising thiolated polyethylene glycol (PEG), wherein thiolated polyethylene glycol (PEG) forms a layer around the SERS marker conjugate. 13. A biosensor comprising a plurality of SERS marker conjugates, wherein a SERS marker conjugate comprises a nanoparticle and a Raman-active marker compound attached to the nanoparticle surface, wherein the compound has Formula I: wherein W is selected from the group consisting of wherein the symbol “*” denotes the point at which W may be connected to the remainder of the compound of Formula I; Y is selected from NH2, N(CH3)2 or is used to denote a single bond or a double bond, andZ is NH, NH2, or or a tautomer or stereoisomer thereof, or a salt thereof. 14. The biosensor according to claim 13, further comprising a substrate, wherein the nanoparticles are adherent to the substrate. 15. Method for the detection of any analyte using a SERS marker conjugate, wherein a SERS marker conjugate comprises a nanoparticle and a Raman-active marker compound attached to the nanoparticle surface, wherein the compound having Formula I: wherein W is selected from the group consisting of wherein the symbol “*” denotes the point at which W may be connected to the remainder of the compound of Formula I; Y is selected from NH2, N(CH3)2 or is used to denote a single bond or a double bond, andZ is NH, or or a tautomer or stereoisomer thereof, or a salt thereof. 16. The method according to claim 15, wherein the analyte is detected in a bodily fluid comprising the analyte. 17. The method according to claim 16, wherein the bodily fluid is selected from the group consisting of plasma, serum, blood, lymph, liquor and urine. 18. The method according to claim 15, wherein the analyte is one selected from the group consisting of proteins, peptides, nucleic acids, carbohydrates, lipids, cells, viruses, small molecules, or haptens. 19. Method for the detection of any analyte using a biosensor comprising a plurality of SERS marker conjugates, wherein the SERS marker conjugate comprises a nanoparticle and a Raman-active marker compound attached to the nanoparticle surface, wherein the compound has Formula I: wherein W is selected from the group consisting of wherein the symbol “*” denotes the point at which W may be connected to the remainder of the compound of Formula I; Y is selected from NH2, N(CH3)2 or is used to denote a single bond or a double bond, andZ is NH, NH2, or or a tautomer or stereoisomer thereof, or a salt thereof. 20. The method according to claim 19, wherein the analyte is detected in a bodily fluid comprising the analyte. 21. The method according to claim 20, wherein the bodily fluid is selected from the group consisting of plasma, serum, blood, lymph, liquor and urine. 22. The method according to claim 19, wherein the analyte is one selected from the group consisting of proteins, peptides, nucleic acids, carbohydrates, lipids, cells, viruses, small molecules, or haptens.